Thanks for the fast reply and detailed information, when you compare the two are they both running on the same battery type? My E03 is much brighter on Li-ion, I'm pretty sure the L10 does not support Li-ion.
BTW, for the Xeno, an older style LumaPower IncenDio clip fits the e03 perfectly between the body and tail cap.
I also swapped out the tail switch boot with a black one from Fenix (again a perfect fit)
Got my clips directly from Lumapower
It’s the washer style clip (not the wire style)
I’ve seen some other clips that will fit, but all were the push on style and no where near as nice and sturdy as this one.
Here's a picture of mine with the clip: